/*
 * Copyright (c) 2005, 2020, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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/*
/*
 ******************************************************************************
 * Copyright (C) 2003, International Business Machines Corporation and   *
 * others. All Rights Reserved.                                               *
 ******************************************************************************
 *
 * Created on May 2, 2003
 *
 * To change the template for this generated file go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
// CHANGELOG
//      2005-05-19 Edward Wang
//          - copy this file from icu4jsrc_3_2/src/com/ibm/icu/impl/StringPrepDataReader.java
//          - move from package com.ibm.icu.impl to package sun.net.idn
//
package jdk.internal.icu.impl;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;

import jdk.internal.icu.impl.ICUBinary;


/**
 * @author ram
 * <p>
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
public final class StringPrepDataReader implements ICUBinary.Authenticate {

    /**
     * <p>private constructor.</p>
     *
     * @param inputStream ICU uprop.dat file input stream
     * @throws IOException throw if data file fails authentication
     * @draft 2.1
     */
    public StringPrepDataReader(InputStream inputStream)
            throws IOException {

        unicodeVersion = ICUBinary.readHeader(inputStream, DATA_FORMAT_ID, this);


        dataInputStream = new DataInputStream(inputStream);

    }

    public void read(byte[] idnaBytes,
                     char[] mappingTable)
            throws IOException {

        // Read the bytes that make up the idnaTrie
        dataInputStream.read(idnaBytes);

        // Read the extra data
        for (int i = 0; i < mappingTable.length; i++) {
            mappingTable[i] = dataInputStream.readChar();
        }
    }

    public byte[] getDataFormatVersion() {
        return DATA_FORMAT_VERSION;
    }

    public boolean isDataVersionAcceptable(byte version[]) {
        return version[0] == DATA_FORMAT_VERSION[0]
                && version[2] == DATA_FORMAT_VERSION[2]
                && version[3] == DATA_FORMAT_VERSION[3];
    }

    public int[] readIndexes(int length) throws IOException {
        int[] indexes = new int[length];
        // Read the indexes
        for (int i = 0; i < length; i++) {
            indexes[i] = dataInputStream.readInt();
        }
        return indexes;
    }

    public byte[] getUnicodeVersion() {
        return unicodeVersion;
    }
    // private data members -------------------------------------------------


    /**
     * ICU data file input stream
     */
    private DataInputStream dataInputStream;
    private byte[] unicodeVersion;
    /**
     * File format version that this class understands.
     * No guarantees are made if a older version is used
     * see store.c of gennorm for more information and values
     */
    ///* dataFormat="SPRP" 0x53, 0x50, 0x52, 0x50  */
    private static final byte DATA_FORMAT_ID[] = {(byte) 0x53, (byte) 0x50,
            (byte) 0x52, (byte) 0x50};
    private static final byte DATA_FORMAT_VERSION[] = {(byte) 0x3, (byte) 0x2,
            (byte) 0x5, (byte) 0x2};

}
